Patch for allowing several V8 instances in process:...

src/compiler.h

 // Copyright 2006-2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 68 matching lines @@
                                              Handle<Script> script,
                                              AstVisitor* caller);
 
   // Set the function info for a newly compiled function.
   static void SetFunctionInfo(Handle<JSFunction> fun,
                               FunctionLiteral* lit,
                               bool is_toplevel,
                               Handle<Script> script);
 };
 
+class CompilerData {
+  StaticResource<SafeStringInputBuffer> safe_string_input_buffer_;
+
+  friend class V8Context;
+  friend class Compiler;
+  CompilerData();
+  DISALLOW_COPY_AND_ASSIGN(CompilerData);
+};
 
 // During compilation we need a global list of handles to constants
 // for frame elements.  When the zone gets deleted, we make sure to
 // clear this list of handles as well.
 class CompilationZoneScope : public ZoneScope {
  public:
   explicit CompilationZoneScope(ZoneScopeMode mode) : ZoneScope(mode) { }
   virtual ~CompilationZoneScope() {
     if (ShouldDeleteOnExit()) {
       FrameElement::ClearConstantList();
       Result::ClearConstantList();
     }
   }
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_COMPILER_H_